A device which controls the voltage and current being delivered to a capacitor or battery.

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1answer
32 views

Change output voltage of a 9.2V charger to 8.4 [on hold]

I had a head light charger. Its output was 8.4V 1000mA. The charger is not working any more. Now I need a new charger. But light company doesn't sell only the charger. Besides, they are promoting new ...
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2answers
74 views

Onboard charging system for hybrid electric tractor

I’m in the process of converting a Cub Cadet SLT1554 from gas to a hybrid-electric tractor using a Motenergy ME0909 PMDC Motor. See description/specifications below: Motenergy ME9090 PMDC Motor ...
-3
votes
1answer
41 views

30-0-30 ACV 8A transformer to 12DCV [on hold]

Good Day.. I have a 30ACV 8A transformer. I urgently want to make a 12DCV battery charger from it. What are the components that I should use? Please also help me out with its schematic. Your help ...
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2answers
42 views

Boost +12v from ATX PSU to ~13.5-14.5v

I understand that what I am doing requires the utmost care and that numerous precautions should be taken in completing a project like this. Out of necessity, I am going to fashion a car battery ...
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1answer
65 views

What if i charge a battery with low ampere.? [closed]

Assuming we have a mobile battery and a charger which has less ampere than the original one. Is it damage the battery? i am asking for just curiosity e.g charging a battery with a universal charger ...
2
votes
1answer
131 views

Questions about Li-ion battery charger and battery monitor chips

I want to build a system powered by 14.8v Li-po battery pack or mains power (selectable power path). When the mains adapter is connected, the battery will be charged and the system will be powered ...
0
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1answer
27 views

LiPo Charging Ciruit - Switching Help

I do understand that similar questions and maybe even the same question has been asked before, I've found them but unfortunately as a result of inexperience on my part I have been unable to adapt the ...
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3answers
88 views

Using Super Capacitors with solar cells and batteries to help save my dogs

I am looking to make a dog feeding mechanism that will operate regardless of power outages. The main point of this query initially is to figure out how to work with the materials I have (or can get) ...
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2answers
49 views

What does battery charger's current rating mean? [duplicate]

I am basically a software engineer but have some interest in electronics so this is probably a very basic question. I understand theoretically a battery or power source can provide as much current as ...
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0answers
49 views

making solar battery charger

I dont know a lot about electrical things but I like it and I like make something for myself . I try to make a solar battery charger . but as I write , my information is not good. I have some ...
0
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2answers
63 views

Bike mobile charger

Hi, I've made a battery operated mobile charger using this circuit. I am able to charge the basic phones (with 2100mAh battery) with it. But the problem is, I couldn't charge any smart phones ...
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1answer
38 views

Charging battery

I have a NiCad battery that I got from an old rc car. I have some trouble charging it. the battery is rated 6v and the charger's voltage is rated 7.25 (why is it bigger)? however, I measured the ...
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2answers
67 views

Is this a viable mini wind turbine setup?

I'm going to build my first wind turbine. I have already constructed the prop, 5 blades 50cm long from PVC pipes. I've searched for a decent sized motor and charge controller. The turbine will be ...
1
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0answers
23 views

Charger for my own created battery pack

I am building an RC airplane, for which I have also created a battery pack. What kind of charger do I need to power up the simple line-up of: 6 x AAA, 1.2v, 800mah per battery. (Everything is lined up ...
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votes
1answer
67 views

Lead Acid Battery Voltage rises very quickly

I am working on a charger for the first time. m charging a lead-acid battery (6V) by supplying a voltage of 7-7.2V & 100mA. But the voltage rises from 6.10 to 6.30 in just 5-10 seconds. What ...
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0answers
59 views

zener diode as rectifier in cheap mobile charger

Opened a very cheap mobile multi charger and find a zener (4.8V, 1/2W) diode is used as rectifier. Surprisingly it is giving ~ 4.9 V when no load and about 430mA to an old 3.8V torch bulb, almost ...
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0answers
25 views

How do laptop chargers work in a wide voltage range? [duplicate]

I took a course on basic Electrical Engineering and learnt about how transformers work. I came to know that transformers change the voltage on the secondary depending on the turn ratio. If so, then ...
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2answers
35 views

difference in charging battery of different Ah

Can i use a lower Ah battery charger(say 20,30)to charge a higher Ah battery ie 110Ah?What are the consequences? What is the difference in the charger circuit in both case?
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1answer
69 views

Is a high current wall charger dangerous for my phone? [closed]

I've bought a USB wall charger to power my Raspberry Pi. I chose the 3A one so that I can connect some more power hungly devices like hard drives to the Pi's USB ports. I can connect 2 cables to the ...
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0answers
52 views

Designing a 3 mode smart solar battery charger with MPPT

I'm trying to design a solar charger with MPPT feature that runs in 3 modes (bulk, absorption and float) depending on the state of the battery. The logic is implemented in a fast micro controller and ...
0
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2answers
86 views

How do I calculate the energy (kWh) consumed by my 5V smartphone charger?

I'm having a little trouble in figuring out how much power is absorbed by my 5v smartphone charger. I'm curious as to how to account the energy loss due to stepdown.
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0answers
64 views

help needed analysing my battery charging algorithm

I have developed a rough charging algorithm which i plan to use in my new solar charger which charges 8 lead acid batteries in series(96v),with a 1KW solar panel setup(4 x 24v,250mW panels in series). ...
0
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1answer
81 views

I want to design an adapter from USB to 4.3v and 70mA

How can I design an adapter between USB and 4.3v and 70mA. Can I just connect a USB cable to my device that takes 4.3v and 70mA? Is it likely to damage the device? I'm looking for a better than 50% ...
0
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1answer
72 views

How is the output voltage of a mobile phone charger fixed to a rated value? [duplicate]

Here is the circuit of cellphone charger. I have seen the input voltage range for a cellphone charger to be 100-230 V but the output voltage to be fixed to the rated value(like ~4.5 V). So, my ...
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votes
2answers
66 views

Using a charger backwards [closed]

I was wondering if connecting a 5 volt source to a 5 volt charger is going to yield 220 volts at the plugging terminals(the charger is AC/DC,220 volts input and 5 volts output)As far as I know,every ...
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0answers
48 views

UPS system with power supply and seperate battery charger

How to build a ups system with a power supply powering the load and battery charger charging/maintaining the batteries? I want to build a UPS system with a 48v power supply powering the main load ...
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votes
2answers
61 views

Li-po - li-ion chargers

I have bought a Li-po charger the other day and I looked up the IC and it stated Li-ion. Can you charge a Li-po with a Li-ion IC? And the other way around? The IC I am talking about is the TP4056. I ...
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4answers
85 views

Watts used by chargers eg laptop, wall warts etc

This is my first question on here, its quite easy and I am sure I have half the answer, maybe. I was thinking about how much power was being used by these wall chargers etc, you read the label it may ...
2
votes
1answer
59 views

ATtiny measuring voltage for battery charger

Would it be possible to use adc with the reference voltage at ground, to determine the voltage of say a battery? I was thinking of creating a battery charger with the attiny for automatic cutoff and ...
1
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1answer
87 views

How charge custom Li-ion pack 36v 10s6p

I have 10x 6p 18650 batteries. 13AH. I found a protection circuit. My issue is that I don't know how to charge the batteries. I could use a power source but I got it from my school and it isn't mine. ...
1
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1answer
118 views

Charging battery through relais and arduino

I'm designing a charger system for my lawn mower robot. The idea that I had is based on a relay. As soon as the robot reaches the charging station, with "Volt Sense" pin it detects a charging ...
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3answers
61 views

recharge AGM batery with 3 phase charger and 277 volt power

I'm helping set up a system for a 3 year project measuring storm water runoff. This is my first project recharging batteries, any comments suggestions and questions will be very helpfull. We have ...
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0answers
74 views

Bq2002 charging circuit design

I've been designing a 4 cell NiMh battery charging circuit. This is my circuit so far. When I power the IC the LED is turned on. My battery has been already charged with the wall socket charger so ...
0
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1answer
63 views

Li-Ion Cell Charger Tips:

I've recently been using an old cell phone charger as a single cell charger to manually charge 18650 li-ion cells. Below is some info about the charger & charging that I have measured. Charger: ...
3
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1answer
39 views

Glitchy Touchscreen Caused by Charger extra question

In this thread Glitchy Touchscreen Caused by Charger the answer states it is from the USB charger not being rated high enough. I am using the Moto G 1st gen and upon using a charger rated for 5v 800 ...
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2answers
205 views

Lithium Ion Cell balancing

I’m making a Lithium Ion charger circuit and successfully used a Texas Instruments bq2057c to charge 2 Lithium Ion cells in parallel (4.2V). Now I want to do the same with the cells in series (8.4V). ...
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0answers
192 views

MCP73831 charger with power source switching

Could someone please recommend what types and values should D1 and D4 be? The Vout current is going to be 200 mA max, most time less than 1 mA. Charger programmed to charge at 320 mA max. When Vin ...
0
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1answer
105 views

Lithium polymer battery charger with LDO and AVR

I am planning to use this in my project. The AVR microcontroller is asleep most of the time (less than 500 µA), and the current draw raises every minute up to 100 mA, but it lasts ...
0
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1answer
42 views

USB car charger input 10vdc instead of 12 VDC

I am running a project where I will have a small steam engine turning a dynamo. the dynamo produces 12VDC no load and 10VDC 10 watts under load. My plan was to buy a car usb charger and connect it up ...
3
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2answers
855 views

Could smartphones benefit from the same charging mechanism as in electronic watches?

A long time ago I learned that electronic wristwatches have a charging device that draws energy from hand movement while the wearer walks. I don't know how much power a wristwatch generates but maybe ...
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0answers
42 views

How to handle a li-ion battery´s 'charge limited volts' specification without damaging it

I´ve found some useful pieces of information about li-ion batteries in various Q&A but not exactly what I wanted to know (not sure if I understand all of them correctly). I charge a smartphone ...
1
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1answer
80 views

LiPo charger with LDO regulator

I have ATmega328P circuit that drains from 0.1 to max 150 mA. Most of the time it's asleep (0.1 mA - with other little components attached) and once a minute it wakes up and drains 80 mA && ...
2
votes
1answer
46 views

How do I use a 680 Volt (DC) solar panel with an off the shelf system?

I've inherited 4 custom built solar panels. These are not consumer grade panels but industrial sized. They produce 680 volts DC at 3.8 amps. The voltage selection was probably selected to minimize ...
0
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3answers
93 views

Most Energy Efficient Charger Design?

What is the best (i.e. most energy efficient (has the least energy loss)) way to reduce 120 VAC to various DC charging levels for simultaneously smart charging: a 12V deep-cycle/starting battery, an ...
3
votes
1answer
69 views

Where does the system load go on a bq51051b charge controller?

I'm trying to use an integrated chip for Qi Charging + lipo management + overcharge protection and all the hard stuff basically. The only one that is 'integrated enough' seems to be: ...
0
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1answer
79 views

Phone charger basic question

I'm (kinda) new to electronics and I have a simple question... So, I have a phone charger and I cut the wire because I wanted to connect the PWR and the GRD to another circuit. But when I connected ...
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1answer
108 views

Isolating batteries from charger

I have an interesting project and I don't know whats the best solution. Basically I have a charger (charges one battery at a time) and 2 batteries. What I want to do is to have the charger charging ...
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0answers
82 views

Overcharging LiPo with current source

What would happen if I charge a LiPo battery with a constant current source? I know that properly it should be charged constant-current until 4.2V and then constant-voltage mode, but what if I just ...
2
votes
1answer
142 views

USB port controller, divider mode and BC compliancy

There're many 'universal' chargers out there on the market which claim to support maximum charging for a range of devices from iPhones, iPads to Samsung Galaxy S5, S6, etc. There're USB charging port ...
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2answers
84 views

Voltage regulator question

I have made a portable device charger with a 5 volt voltage regulator(7805-TO220 package),a 9 volt battery and a few capacitors.The problem is,when I connect the charger to a certain device(whose ...